Coherent Raman mixing and coherent anti-Stokes Raman scattering from individual micrometer-size droplets

The coherent Raman mixing spectra from individual micrometer-sized droplets of ethanol and of water consist of regularly spaced peaks that correspond to the morphology-dependent resonances of a spherical droplet. In contrast, the coherent anti-Stokes Raman scattering spectra from droplets exhibit no morphology-dependent peaks. Both results are explained by the spatial overlap of the enhanced internal field distributions and by the phase-matching conditions associated with the droplet.